Page Links: Index Page
Old Boeing Driver
June 12, 2025, 16:40:00 GMT permalink Post: 11899451 |
I agree
It is, in fact, possible to take off with insufficient power to fly. Sounds daft, but even with a low power setting, the aircraft will accelerate on the runway, since there is only profile drag to overcome. Then, having used an awful lot of runway, it achieves just enough speed to be hauled off the ground. At this point, you add induced drag to profile drag, and at the necessarily high angle of attack there would be an enormous amount of induced drag. The aircraft is now airborne, but on the wrong side of the drag curve.
In 45 years of flying I have never seen this done with a full sized aircraft ( thankfully ), but I have seen it happen with a model aircraft. Owner could not understand how it could take off but not fly. I know it seems improbable in this case, but it does fit the facts. Airborne right at the end of TORA, no apparent engine failure/yaw, but a decaying airspeed and increasing sink rate. Last edited by Old Boeing Driver; 12th June 2025 at 16:43 . Reason: Spelling Subjects: None |
Old Boeing Driver
June 12, 2025, 16:56:00 GMT permalink Post: 11899468 |
Rough Estimate
Depending on temps, the B787-800 holds about 221,000 pounds of fuel, and this flight probably required about 120,000 pounds including alternate requirements. Rough estimate.
Subjects: None |
Old Boeing Driver
June 12, 2025, 16:59:00 GMT permalink Post: 11899474 |
Subjects: None |
Old Boeing Driver
June 12, 2025, 19:33:00 GMT permalink Post: 11899653 |
Condolences to all the people who have lost loved ones:
I have a question about that: As the plane would have been fully fueled (say 50t), a full flight and full luggage etc - and if it didn't have enough speed for - say no flaps, short takeoff, pulled up before V1 - and assuming both engines were 'ok': Aren't aircraft nowadays require only one engine for a takeoff in an emergency (one assumes that would be a in fully loaded configuration)...? If so, then surely two fully good engines should have no problem, particularly when it's taken off already...? Subjects (links are to this post in the relevant subject page so that this post can be seen in context): Condolences V1 |
Old Boeing Driver
June 13, 2025, 23:28:00 GMT permalink Post: 11900998 |
Everyone here should read post #867
Subjects: None |
Page Links: Index Page